Erasing 1 byte of external Flash memory (winbond)

Question

i'm trying to use an external flash memory Winbond 25q64jvsiq for my Arduino Nano based project for audio recording purposes, to have extra memory for recording 1 byte audio samples, since Arduino nano SRAM memory is too small (8kb), to store at least 1 second of 8 kHz 8 bit samples audio. I'm trying to understand the basics of bytes storing in my external memory. I'm using SPIMemory library for that, and i can't find a function to erase 1 byte, there is only sectorErase() function. So i wonder is it even possible to erase a single byte of external memory?

Here is a part of code where i try to rewrite (erase one byte and write a new one) a next byte when the button pressed, but when it erase a sector it erases not the one byte but all bytes behind it, and i want to manipulate it more accurate, and erase only one byte:

if(!digitalRead(5)){      //button pressed
     if(e<3){
      e++;
      flash.eraseSector(count);    //erasing a byte
      flash.writeByte(count,e,NOERRCHK); // write a new value
      }  else {  
        e=0;
        flash.eraseSector(count);
        flash.writeByte(count,e,NOERRCHK);
        }
     }

Answer 1

For a flash chip, no it's not possible to erase a single byte.

The closest you can do is to read an entire sector into memory, erase that sector, modify your in-memory copy, then write the sector back.

You would be better using an SPI SRAM or PSRAM chip instead of a flash chip.